SLVSH95 July 2024 TPS546C25
ADVANCE INFORMATION
The TPS546C25 device monitors the output voltage (VOSNS − GOSNS) to provide overvoltage (OV) and undervoltage (UV) protection. The Tracking OVF and Tracking UVF thresholds both track to the VOUT setting but can be selected independently.
When the output voltage (VOSNS − GOSNS) drops below the VOUT setting by the value configured in VOUT_UV_FAULT_LIMIT register, the tracking UVF comparator detects and an internal UVF Response Delay counter selected in VOUT_UV_FAULT_RESPONSE register begins. At the same time, the UVF bit in STATUS_VOUT register is set.
The tracking UVF function is enabled only after the soft-start period completes.
During the UVF Response Delay, if the output voltage (VOSNS − GOSNS) rises above the UVF threshold, thus not qualified for a UVF event, the UVF response delay timer resets to zero. When the VOUT drops below the UVF threshold again, the UVF response delay timer re-starts from zero.
The TPS546C25 device also offers tracking UV Warning (UVW) function. The VOUT_UV_WARN_LIMIT shows the available tracking UVW thresholds. When the output voltage (VOSNS − GOSNS) drops lower than the VOUT setting by the value configured in VOUT_UV_WARN_LIMIT register, the tracking UVW comparator detects and the UVW bit in STATUS_VOUT register is set. There is no purpose delay for UVW event.
When the output voltage (VOSNS − GOSNS) rises higher than the VOUT setting by the value configured in VOUT_OV_FAULT_LIMIT register, the tracking OVF comparator detects and the device responds to the OV fault immediately per the selection inVOUT_OV_FAULT_RESPONSE register. At the same time, the OVF bit in STATUS_VOUT register is set.
The tracking OVF function is enabled only after the soft-start period completes.
The TPS546C25 device also offers tracking OV Warning (OVW) function. When the output voltage (VOSNS − GOSNS) rises higher than the VOUT setting by the value configured in VOUT_OV_WARN_LIMIT register, the tracking OVW comparator detects and the OVW bit in STATUS_VOUT register is set. There is no purpose delay for the OVW event.